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From Politico (referred to in the Breitbart article):

Thucydides is especially beloved by the two most influential figures on Trump’s foreign policy team. National security adviser H.R. McMaster has called Thucydides’ work an “essential” military text, taught it to students and quoted from it in speeches and op-eds. Defense Secretary James Mattis is also fluent in Thucydides’ work: “If you say to him, ‘OK, how about the Melian Dialogue?’ he could tell you exactly what it is,” Allison says—referring to one particularly famous passage. When former Defense Secretary William Cohen introduced him at his confirmation hearing, Cohen said Mattis was likely the only person present “who can hear the words ‘Thucydides Trap’ and not have to go to Wikipedia to find out what it means.”
That’s not true in the Trump White House, where another Peloponnesian War aficionado can be found in the office of chief strategist Steve Bannon. A history buff fascinated with grand conflict, Bannon once even used “Sparta”—one of the most militarized societies history has known—as a computer password.
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“Most people in Washington have almost no historical memory or grounding,” Allison says. “Mattis reads a lot of books. McMaster can quote more central lines from more books than anybody I know. And Bannon reads a huge amount of history. So I think this is an unusual configuration.”